Polyphase reactance-coil.



P. TORCHIO H. R. WOODROW.

POLYPHASE REACTANCE COIL.

APPLICATION mw Mlm. l5. |911.

Patentd Oct. 9.1917.

2 SIETS-SHEET l P. TORCHIO H. R. WUODROW.

POtYPHASE REACTANCE COIL.

Armcmou mw ma. ls. 19u.

Patented Oct. 9, 1917.

2 SHEETS-SHEET 2.

INVENTUM Q-nzlo Mr f?. fw un U Arro fr lifitphmav ont. 911917.

. i LUX/...1x 1.,: ;i..;. '.11 y Appuation mea March 15, 19117. serial No. 155,065.

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The coils A, B, C, D, E are separated by parallel wooden bars 6, 7, 8, 49 disposed in the intervening spaces, said bars projecting at each end beyond the circumference of the coils. Between the protruding ends of said bars are spacing blocks lwhich are curved to fit u on the coil peripheries Rods ll-prefera ly covered with shellacare received in registering openings in said bars and spacingbloelis, as shown ,in Fig. v7.

The casing comprises two rectangular and parallel end walls 12, 13 of "porcelain, between which are interposed two. partitions 38, 39 of like material.l The sets, X, Y,Z of coils are placed in the compartments between said partitions and said walls. The' construction of the casing between wall 12 and partition 38, or between wall 13 and partition 39, or between partitions 38, 39, is the same, so that a description of said construction between wall 12 and partition 38 will apply to all. Between said wall and partition and at the upper corners of the same are interposed two series of porcelain blocks-one of said series being numbered 14, 15,16, 17, 18, 19. The'outer edges of said blocks register with the corresponding edges of said wall and partition. The inner corners of blocks 15, 16, 17, 18 are suitably formed to lit against the circumferential periphery of the coils. The blocks 14, 19 at the ends of the series at their inner corners have integral arms 20, 21, Fig. 5, which extend over the outer faces of coils A and E.

Between said wall and partition and at the lower corners of the same are interposed two series of porcelain blocks-one of said series being numbered 22, 23, 24, 25, 26, 27. The outer edg'es ofsaid blocks registerwith corresponding edges of said wall and partition, and the inner corners of blocks 23, 24:, 25, 26 are suitably formed to iit against the circumferential periphery of the coils. The blocks 22, 27 of both series at their in ner corners have integral arms 29, V30, similar to arms 20, 21, which also extend over the outer faces of coils A and E, and bctween said faces and said wall and partition. Headed bolts 31, preferably inclosed in insulating tubes, extend through walls 12, 13, said partitions 38, 39 and 'said blocks, and clamp all parts together. The blocks may also be cemented together.

In the lower faces of the upper series of interposed blocks and in the upper faces of the lower series of interposed blocks on each side of the casing are grooves 32, into which may be slid panels 33, Fig. 1, for closing the rectangular space between said upper and lower blocks and said Walls or partitions. In the opposite faces of the two series of interposed blocks above the coils are rooves which receive wooden bars 34, and in the opposite faces of the two series of interposed blocks below the coils are grooves which receive wooden bars 35. There are intervals between said bars to provide for the ventilation of the inclosed coils, duc to thc natural draft induced bythe radiated heat from the windings.

The leads G I, G I and G2 I2 are inclosed in quadrangular bushes 36, 37 of insulating material. The inner wall of each bush is cutaway to form a shoulderhwhich shoulders rest upon two of the bars 34. The

`leads G, G', G2 extend through the channels between the three remaining bush walls; the leads I, I I2 do not, because the horizontal bent portion of each lead I, I', I2 connects, as already explained, with windings 5,'While the horizontal bent portionA F of each lead G, G', Gr2 connects with windings 1 of coils A, B, C, D, E.

The terminals G I, G I', G2 I2 are to be connected respectively to `different phases of the generator, as indicated symbolically at T, Fig. 4.

The three sets of coils X, Y, Z are respectively wound in the directions shown in Fig. 8: thatis to say, the middle set Y is wound in the opposite direction to that of the two outer sets X, Z. With this connection, each of the outside sets has an additive mutual inductance or boost to the inner set, and the attractive stresses thereby produced under heavy currents between the'outside sets and the inner set are in a compression direction. The two outside sets, however, 'will have a subtracting mutual inductance, (buck), and the stresses produced will be repulsion. As the distance between the outside sets is large, these stresses become comparatively smalland the strains are taken care of by the heavy, preferably bronze, bolts 31. U A

The number of windings 1, 2, 3, 4, 5 011 the two outside sets X, Z may be greater than that of the inner set Y--in which, for example, the outer winding 5 may be omitted-so as to give a completely balanced apparatus electrically, as the inner set has an additive mutual inductance with respect to each of the outer sets.

We claim:

1. A poly hase reactance a paratus, comprisuig a p urality of sets o parallel coils of the pancake type, said sets of coils be`l in respectively connected in multiple with di erent phase currents.

2. A polyphase reactance apparatus, comprising a casin transverse partitions of insulating material dividin said casing' into three compartments, and t ree sets of parallel coils of the pancake type, said Sets being respectively inclosed in said 'compartments, and said sets bein respectively connected in multiple with different phase currents.

3. A polyphese reuctunce apparatus, com- In testimony whereof We have axed our grising tliree setls n parallel coils of the signatures n presence of two witnesses.

pancake type, tie irection of winding of the middle set of coils being opposite to that of the winding of the outer sets of coils and the said sets of coils being respectively con Witnesses: nected in multiple with different phase cur- GERTRUDE T. PORTER, rents. MAY T. MGGARRY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

